タグ・グループを Wiki から分離 (#425) (#429)

Reviewed-on: #429
Co-authored-by: miteruzo <miteruzo@naver.com>

backend/app/representations/wiki_page_repr.rb

@@ -25,6 +25,10 @@ module WikiPageRepr
       'deprecated_at' => tag.deprecated_at }
   end
 
+  def tag_group tag_group
+    TagGroupRepr.tag_group(tag_group)
+  end
+
   def many wiki_pages
     wiki_pages.map { |p| base(p) }
   end